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• W4238607846 abstract "Abstract. The cumulative atmospheric nitrogen deposition has been found to profoundly impact the nutrient stoichiometry of the East China seas (ECSs) and the northwestern Pacific Ocean (NWPO). In spite of the potential significance of dry deposition in those regions, ship-board observations of atmospheric aerosols remain insufficient, particularly, for compositions of water-soluble nitrogen species (nitrate, ammonium and water-soluble organic nitrogen – WSON). We conducted a cruise covering the ECSs and the NWPO during the spring of 2014 and observed three types of atmospheric aerosols. Al content, air mass backward trajectory, weather condition, and ion stoichiometry allowed us to discern dust aerosol patches and sea fog modified aerosols (widespread on the ECSs) from background aerosols (open ocean). Among the three types, sea fog modified aerosols contained the highest concentrations of nitrate (536 ± 300 nmol N m−3), ammonium (442 ± 194 nmol N m−3) and WSON (147 ± 171 nmol N m−3); moreover, ammonium and nitrate together occupied ~ 65 % molar fraction of total ions. The dust aerosols also contained significant amounts of nitrate (100 ± 23 nmol N m−3) and ammonium (138 ± 24 nmol N m−3) which were obviously larger than those in background aerosols (26 ± 32 and 54 ± 45 nmol N m−3, respectively, for nitrate and ammonium), yet this was not the case for WSON. It appeared that dust aerosols had less of a chance to contact WSON during its transport. In the open ocean, we found that sea salt (e.g. Na+, Cl−, Mg2+), as well as WSON, correlates positively with wind speed. Apparently, marine WSON was emitted during breaking waves. Regardless of the variable wind speeds from 0.8 to as high as 18 m s−1 nitrate and ammonium, by contrast, remained in narrow ranges implying that some supply and consumption processes of nitrate and ammonium were required to maintain such a quasi-static condition. Mean dry deposition of total dissolved nitrogen (TDN) for sea fog modified aerosols (1090 ± 671 μmol N m−2 d−1) was 5 times higher than dust aerosols (190 ± 41.6 μmol N m−2 d−1) and around 20 times higher than background aerosols (56.8 ± 59.1 μmol N m−2 d−1). Apparently, spring sea fog on the ECSs played an important role in removing atmospheric reactive nitrogen from the Chinese mainland and depositing it into the ECSs, thus effectively preventing its seaward export to the NWPO." @default.
• W4238607846 created "2022-05-12" @default.
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• W4238607846 date "2015-09-18" @default.
• W4238607846 modified "2023-09-22" @default.
• W4238607846 title "Nitrogen speciation in various types of aerosol in spring over the northwestern Pacific Ocean" @default.
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• W4238607846 doi "https://doi.org/10.5194/acpd-15-25583-2015" @default.
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